EUGENE -- When Oregon revealed its 103-player roster Monday morning, transfer quarterback Vernon Adams Jr. was not on it. But he's expected to join the roster later in fall camp, perhaps even later this week.

"Nothing has changed," third-year Oregon coach Mark Helfrich said of Adams, who is awaiting clearance after taking a math class this summer to complete graduation from Eastern Washington.

Junior running back Thomas Tyner's name was also missing, however. And according to Helfrich, his return to the team is uncertain.

"He's not going to be in fall camp and his availability after that remains to be seen," Helfrich said Monday inside Autzen Stadium, where players met with reporters to kick off fall camp.

Tyner underwent surgery Aug. 7 and is expected to miss the entire 2015 season while rehabbing an injured left shoulder, said his father, John Tyner, on Sunday. Helfrich wouldn't comment on why the surgery didn't happen earlier in the offseason.

Tyner's father expects his son to be healthy in time for spring football, but Helfrich wouldn't speculate Monday whether he expected Tyner to be a member of the team by then.

Also off the roster is veteran Stetzon Bair, a reserve who switched from defensive line to offensive line last season.

Tyner is not the only player whose availability remains in flux as fall camp begins; recruit Jonah Moi also is still not on the roster. Receivers Darren Carrington and Devon Allen are facing different hurdles to their seasons; Carrington is awaiting word from the NCAA about whether he must serve a half-season of ineligibility after failing an NCAA-run drug test. Allen, meanwhile declared his confidence in his health yet remains just seven months removed from injuring the anterior cruciate ligament in his knee during the Jan. 1 College Football Playoff semifinal at the Rose Bowl.

The Ducks will practice six days a week in preparation for the Sept. 5 season opener against Eastern Washington. The first two days of practice will be in "shells" -- helmets and shorts. The Ducks will don shoulder pads Wednesday and, due to NCAA rules, are allowed to wear full pads beginning Friday.

A few more notes from media day:

Outside linebacker Justin Hollins isn't ready to practice at full speed quite yet after saying he injured an Achilles tendon during spring football. Hollins, a 6-foot-5 sophomore, could compete for a starting job left vacant by graduated outside 'backer Tony Washington.

Ty Griffin left spring without a "clearly defined role" on offense and still has yet to find a permanent home. Griffin is a compact, 6-foot, 205-pound athlete who played option quarterback at Georgia Tech before transferring to UO last offseason and redshirting the 2014 season. He called himself "disappointed" by the possible position switch to receiver but understood it was a possibility when he came to Eugene last summer. Griffin studies with the quarterbacks, and called the transition to running routes a smooth one because quarterbacks must know everything about the offense.

On the offensive line, Elijah George is healthy to practice after recovering from a knee injury in fall camp one year ago. George is a 6-foot-5 redshirt sophomore from Las Vegas who feels most comfortable playing guard. He said his rehab took place alongside Tyler Johnstone, who himself injured a knee in fall camp, as well. Johnstone also should be fully healthy to compete in fall, Helfrich said.